e-Polymers (Sep 2021)

Study on the thermal properties and insulation resistance of epoxy resin modified by hexagonal boron nitride

  • Guo Lei,
  • Ding Shilin,
  • Yuan Shuai,
  • Gou Xiaofeng,
  • Cai Fenglin,
  • Wang Dongyang,
  • Zhao Haiquan

DOI
https://doi.org/10.1515/epoly-2021-0069
Journal volume & issue
Vol. 21, no. 1
pp. 681 – 690

Abstract

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To study the effect of doping hexagonal boron nitride (h-BN) on the thermal properties and insulation resistance of epoxy resin (EP) and the mechanism of this effect, h-BN/epoxy composites with h-BN content of 0, 10, 20, 30, and 40 phr were prepared. Meanwhile, the corresponding molecular dynamics model of h-BN/epoxy composites was established, and the thermal conductivity, volume resistivity, glass transition temperature, and microstructure parameters of h-BN/epoxy composites were obtained. When the h-BN content is 40 phr, the thermal conductivity of h-BN/epoxy composite is increased by 138% compared to pure EP, and the glass transition temperature is increased by 76 K. At the same time, doping h-BN will reduce the insulation performance of EP. However, the lowest volume resistivity of h-BN/epoxy composite is still 1.43 × 1015 Ω·cm, and the EP composite still has good insulation performance. The fraction free volume and mean square displacement of EP decrease with the doping of h-BN, which indicates that h-BN can hinder the movement of molecular segments of EP, which is the reason for the increase in glass transition temperature.

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